The reaction of compound $P$ with $\mathrm{CH}_3 \mathrm{MgBr}$ (excess) in $\left(\mathrm{C}_2 \mat

Question

The reaction of compound $P$ with $\mathrm{CH}_3 \mathrm{MgBr}$ (excess) in $\left(\mathrm{C}_2 \mathrm{H}_5\right)_2 \mathrm{O}$ followed by addition of $\mathrm{H}_2 \mathrm{O}$ gives $Q$. The compound $Q$ on treatment with $\mathrm{H}_2 \mathrm{SO}_4$ at $0^{\circ} \mathrm{C}$ gives $R$. The reaction of $R$ with $\mathrm{CH}_3 \mathrm{COCl}$ in the presence of anhydrous $\mathrm{AlCl}_3$ in $\mathrm{CH}_2 \mathrm{Cl}_2$ followed by treatment with $\mathrm{H}_2 \mathrm{O}$ produces compound $S$. [Et in compound $P$ is ethyl group]

Professor PC Thomas Classes · Answer

See detailed solution for explanation.